William harvey



r 'uiten .taten @anni ffice.

.WILLIAM HARVEY, OF ALBANY, NEW YORK.

Letters Patent-Noi 74,220, dated February 11,1868; anteiiated September 12,1867.

IMPROVED PADLOGK.

TO ALL WHOM '1T MAY CONCERN:

Be it known that I, WILLIAM HARVEY, of the city and county of Albany, in theState of New York, have invented a certain new and useful'linprovemeut in Locks, specially applicable to padlocks, of which the following is a full, clear, and exact description, relrence being had to the accompanying drawing, which forms part cf this speoilication, and in whichhignre 1 represents an interior view of a padlock constructed according to my improvement, and showing it in its locked condition. i

Figure 2, 'a similar view, with'the `one boltior tumbler withdrawn from the shackle.

Figure 3, a like view, with both bolts withdrawn and the shackle shot open; and

Figure 4, a face view ci' a modification of certain details.

Like letters refer to like parts in all the figures.

My improvement relates to that description of locks in .which two bolts or tuinblers are used, and in which the operation of withdrawing one boltholds back the other bolt till the first is released,'when, or after which,

A in the further action of' the key, the second bolt is shot back, and, in the case gf a padlock, the shackle thrbwl open by'a'spring; and my invention consists, firstly, in a combination with two bolts or tumblers, operating as above described, and which may he separate and detached from each other, of a spring arranged so to unite or Vpress upon' both bolts as that the shooting back or withdrawing of one bolt causes the spring to act with increased force to hold to its lock the other, and whereby not onlylis one spring made to suice for both bolts, but the lock is protected against picking; and the nature of my invention, in its application to padlocks, further consists in a peculiar application to the root or hinged portion of the shackle, of a spring to lift the shackle when both bolts are withdrawn. y

To enable others skilled in constructing and working locks to make and use my invention,l I will now proceed to describe it with reference .to the drawing, in which i l i A represents the shell or case of e.- padlock, B the shackle,A and u the key-centrepcst. The upper or outer tumbler C is pivoted, at a, `to the shell, and has its shackle-locking arm or bolt-end, b, made to withdraw from gear with the shackle by the key, acting under a concave surface, c, of the lower-arm of the tumbler, whicharm is extended, as at al, that may strike a stop, e, when the bolt is shot, and this extension made to terminate in an I arm br projection, j', inclining or running back towards the bolt-end 6.` D is the under or inner tumbler, that may have a sliding action, after the manner of a bolt, on the stop e, and pln J2, and which is'shaped or cut away at z, to admit ofthe key turning to unlock the upperfbolt, C, without, whilst doing so,'acting on the under bolt D,.and not until the key acts against a convex or projecting surface, z', does it begin to shoot the under bolt back. The bolt-end proper or shackle-locking end, 15, of this inner bolt is recessed at its back to receive `within and against it the one end of a spring, Z, carried by the arm or projectiomf, ofthe outer bolt.

The spring thus arranged acts upon both bolts to shoot them, and keep them in lock with the shackle, and, as the one independent bolt or outer tumbler, C, is being shot back by the key, said spring is compressed, and its force or pressure increased against the inner bolt D, to hold it in lock with `the shackle, and its resistance yet farther increased on shooting back the under bolt. The two bolts thus united by the one spring, though separate in their action, only moving together when shooting into lock by the action of said spring, `cannot be picked,l as where the bolts thus operating are acted upon by independent springs, as the forcing back of one bolt locks tighter the other, and neither bolt acts one upon the other to unlock. Infact, alock thus constructed cannot b opened by an ordinary pick, norbe opened without the key, or a special tool that will hold one bolt back while drawing the other. Of cour-sarthe same principle may be carried out by variously modifying the shape ofthe tumblers to suit different kinds of springs, or even to suit the same description ofspring, as in the modification shown in iig. 4, where the spring may be arranged on an arm, m, attached to thc lower bolt D, and

lie atits other end in a recess, fn, of thc upper bolt, C. i p

To shoot thc shackle open, when theitwo bolts are withdrawn, I'pivot, at o', a spring-p, to the shell or shell*- cover, said spring bearing againsta stop or fulcrnm, q, and its upper end being compressed, when the shackle is closed, by a lip, 1*,projecting from the root or hinged end of the shackle B, below its joint-pin, s'. Thisspring, when both boltsare shot back, throws open the shackle, has considerable ot' a range in a short action on the shackle, and is not so liable to be broken or damaged on slamming to'theshaekle as when arranged to operate against the front end of the latter. Where the lock is other than a. padloek,iand the bolts shoot into a. hasp, as .in trunkfor box-locks; Vthis last-named spring, p, of course, is dispensed with. Y

What I clam'herein as new and useful, and desire to secure by Letters Patent, is The combination of thepivoted .tumblers or bolts, GD, with the spring Z, eonstrueted,arranged, and operatingsiibstznntially as described. I i

W. HARVEY. Witnesses l 

